Add basic support for CORE Office -> CORE Lane export

just products data so far

rattail_corepos/corepos/common/importing.py

@@ -0,0 +1,67 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2021 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation, either version 3 of the License, or (at your option) any later
+#  version.
+#
+#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Common importing logic for CORE-POS
+"""
+
+from rattail import importing
+
+
+class ToCore(importing.ToSQLAlchemy):
+    """
+    Base class for all CORE model importers; i.e. anything which uses
+    a CORE DB for the local side.
+    """
+
+    def create_object(self, key, host_data):
+
+        # NOTE! some tables in CORE DB may be using the MyISAM storage engine,
+        # which means it is *not* transaction-safe and therefore we cannot rely
+        # on "rollback" if in dry-run mode!  in other words we better not touch
+        # the record at all, for dry run
+        if self.dry_run:
+            return host_data
+
+        return super(ToCore, self).create_object(key, host_data)
+
+    def update_object(self, obj, host_data, **kwargs):
+
+        # NOTE! some tables in CORE DB may be using the MyISAM storage engine,
+        # which means it is *not* transaction-safe and therefore we cannot rely
+        # on "rollback" if in dry-run mode!  in other words we better not touch
+        # the record at all, for dry run
+        if self.dry_run:
+            return obj
+
+        return super(ToCore, self).update_object(obj, host_data, **kwargs)
+
+    def delete_object(self, obj):
+
+        # NOTE! some tables in CORE DB may be using the MyISAM storage engine,
+        # which means it is *not* transaction-safe and therefore we cannot rely
+        # on "rollback" if in dry-run mode!  in other words we better not touch
+        # the record at all, for dry run
+        if self.dry_run:
+            return True
+
+        return super(ToCore, self).delete_object(obj)